Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
  • H01H85/02—Details
  • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
  • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
  • H01H85/044—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified
  • H01H85/045—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified cartridge type
  • H01H85/0456—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified cartridge type with knife-blade end contacts
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
  • H01H85/02—Details
  • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
  • H01H85/05—Component parts thereof
  • H01H85/143—Electrical contacts; Fastening fusible members to such contacts
  • H01H85/153—Knife-blade-end contacts
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
  • H01H85/02—Details
  • H01H85/20—Bases for supporting the fuse; Separate parts thereof
  • H01H85/203—Bases for supporting the fuse; Separate parts thereof for fuses with blade type terminals
  • H01H85/204—Bases for supporting the fuse; Separate parts thereof for fuses with blade type terminals for low voltage fuses with knife-blade end contacts

Definitions

• the invention relates to the field of fuses, including fuses used in automotive applications, such as for example electric vehicle fuses.
• the fuses used in the automotive field especially for strong currents (for example 32A, 450V) are made from the same fuse base 1 (for example according to the ZXC model of Littlefuse®), available for many applications.
• this fuse base generally comprises
• an insulating body 2 extending between two ends
• FIG. 1 This fuse base 1, common to many types of fuse, is then completed with a tab 4 or a blade so that, depending on the applications, the caps 3 can be electrically connected to an electrical circuit by screwing or welding these tabs 4, or even by connecting these tabs 4 with female contacts.
• a tab 4 or additional blade is generally itself welded to each base 3.
• Figures 2a, 2b, 2c and 2d Examples of this type of fuse of the prior art are shown in Figures 2a, 2b, 2c and 2d.
• Figures 2a and 2b are shown in elevation, respectively at two angles at 90 ° to each other, fuses with tabs 4 welded to the caps 3 and drilled to use a screw connection.
• Figures 2c and 2d are shown in elevation, respectively at two angles at 90 ° to each other, fuses with tabs 4 welded to the caps 3 and having a tongue shape to use a connection with a female contact.
• the caps 3 and the tabs 4 thus added are generally made of copper alloy. But in this case, so with two-part connection ends, the electrical performance is not optimal. Recently, it has been proposed to improve the electrical performance of the electrical connections at the ends of the fuses by replacing the legs 4 of copper alloy welded to the bases 3, by monobloc parts 5 (see FIGS. 3a, 3b, 3c). ) of pure copper, each comprising a base 3 extended by a tab 4. Thus, for example, it has been found that heating of an end consisting of a single piece 5 at an intensity of 32A remains below 40.degree. it can rise to more than 50 ° C with ends consisting of two parts (base 3 + lug 4 welded to the base 3).
• a fuse for a motor vehicle electrical circuit comprising
• At least one of the electrically conductive tabs made of material with a base consists of a tongue formed of a crushed portion of the one-piece piece.
• the crushed tab which is therefore of flattened shape, either to weld it directly to the end of an electric cable, or to pierce it with a hole in which a screw can be inserted to fix the end of a cable or electrical bar, or to insert it into a female contact to which is connected the end of a cable or an electric bar.
• the invention we find at least in part the flexibility that had been desired by achieving a reusable common base, with an additional part, with several types of connection.
• the fuse according to the invention may comprise one or the other of the following characteristics considered independently of one another or in combination with one or more other:
• each of the two caps is extended by a connection tab made of material with a base, each tab being formed of a crushed portion of a single piece;
• At least one electrically conductive tab made of material with a base corresponds, before crushing, to a crimping portion
• At least one electrically conductive tab made of material with a base is before crushing a portion of hollow cylinder;
• a tongue has a cross section, after crushing, whose length is between 6 and 11 mm;
• a tongue has a cross section, after crushing, whose width is between 4 and 7 mm;
• At least one piece is pure copper.
• the invention is a method of mounting a fuse for a motor vehicle electrical circuit, in which a fuse according to the invention is provided and at least one tongue of this fuse is connected to a circuit. electric insertion of the tongue into a female electrical contact.
• the invention is a method of mounting a fuse for a motor vehicle electrical circuit, in which a fuse according to the invention is provided and at least one tongue of this fuse is connected to a fuse. female electrical circuit by welding a conductive element on the tongue.
• the invention is a method for manufacturing a fuse for a motor vehicle electrical circuit, in which a part comprising a body extending between two ends,
• At least one of the electrically conductive tabs made of material with a base is crushed to form a tab.
• FIG. 1 shows schematically in elevation a fuse base type ZXC Littlefuse®
• FIGS. 2a to 2d show diagrammatically in elevation the fuses of the prior art, comprising a Littlefuse® type ZXC fuse base, with additional tabs;
• FIG. 3a, 3b and 3c respectively show in elevation, in section and viewed from one end, a fuse piece before implementation of the method according to the invention and crushing of its crimping portions;
• Figures 4a, 4b and 4c show in a similar manner to Figures 3a to 3c, a fuse obtained after implementation of the method according to the invention.
• FIG. 4a, 4b and 4c An example of a fuse 1 according to the invention is shown in Figures 4a, 4b and 4c. This results from the implementation of the method according to the invention on the part shown in Figures 3a, 3b and 3c.
• this example is a fuse for fitting an electrical circuit in a motor vehicle.
• This fuse comprises a body 2, two caps 3 and a fuse element 6.
• the body 2 extends between two ends.
• This body 2 has, in this example, a cylindrical wall of revolution about a longitudinal axis L.
• This wall is made of insulating material.
• This wall delimits a space inside which is placed the fuse element 6 electrically connecting the two caps 3.
• This fuse element 6 is for example a wire, a filament, a band, etc., metal or fusible alloy.
• Each of the caps 3 also has a cylindrical wall 7 of revolution about the longitudinal axis L, covering a longitudinal end of the wall of the body 2 and is closed by a transverse wall 8 end, substantially perpendicular to the longitudinal axis L.
• a lug 9 extends from the transverse wall 8, opposite the body 2.
• This lug 9 is a single piece 5, with the base 3 which supports it.
• This piece 5 is for example a metal alloy or pure metal, for example pure copper (more than 99%)
• Each tab 9 may take various forms suitable for forming a tongue 10 after crushing.
• this tab 9 may have a hollow or solid cylinder shape, of revolution or not.
• the tab 9 is crushed to form a flattened tongue 10, compressing a portion of the lug 9 of each piece 5, perpendicularly to the longitudinal axis L (see arrows in FIG. 4b ).
• a tongue 10 obtained from the crushing of a hollow cylinder is shown in Figures 4a, 4b, 4c.
• This tongue 10 has for example a length D of 7 mm, and a cross section of 0.8 mm wide by 6.3 mm in length m.
• This tongue 10 may be pierced with a hole in a direction perpendicular to its main faces (similar to the fuse shown in Figures 2a and 2b). In this hole, a screw can be inserted to secure the end of an electrical cable. [025] This tongue 10 may also be electrically connected to a cable or a circuit by insertion into a female contact (similar to the fuse shown in Figures 2c and 2d). This tongue 10 can also be electrically connected to a cable or a circuit by welding, on a cable, a circuit, a conductive bar, etc.

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• Fuses (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=60765899

Family Applications (1)

Country Status (3)

Citations (3)

• 2017
  • 2017-10-30 FR FR1760219A patent/FR3073078B1/fr active Active
• 2018
  • 2018-10-18 WO PCT/EP2018/078642 patent/WO2019086266A1/fr unknown
  • 2018-10-18 EP EP18785684.4A patent/EP3704731B1/de active Active

Patent Citations (3)

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